Students have always been able to collaborate within Google and submit them to a teacher on Canvas. But, there is now a "Collaborations" function in Canvas that will allow the teacher to start the collaboration, essentially creating a document that they will be able to see from start to finish.  

To grade a collaboration, a teacher can either look at it in the Collaborations tab and do the grading in an assignment set up for no submission, or they could have a student submit the link through an Assignment set up for Google Drive/URL link.

To create a collaboration:

• Click on the Collaborations tab on the left side of the Canvas screen.

• Click on "+Collaboration" and be sure to choose the LTI 1.3 option (first screenshot).

• Give the collaboration a name, choose the type of Google file you want to collaborate on, give the project a description, and invite your collaborators (middle screenshot). Click Create.

• Finally, give the file a name and click on Create one last time (last screenshot).

To find a collaboration, students will go to the Collaborations tab on their Canvas page and click on the one they want to work on. 

If you choose to use collaborations, be sure you make that tab visible to students by going to your settings, navigation, and enabling that tab for students.